Zadhan Abu Imran (may Allah have mercy on him) narrates that Sayyiduna Ibn Mas'ud (may Allah be pleased with him) said to him: "O my brother, we have a gathering, so come to us as well." So I came to his gathering and learned seventy surahs from him. Then Sayyiduna Abdullah (may Allah be pleased with him) said to me: "I took them from the mouth of the Messenger of Allah (peace and blessings be upon him); Jibril (peace be upon him) brought them down from the Lord of the Worlds, the Mighty and Majestic."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 8415